An airstrike that killed 11 Philippine soldiers in friendly fire was the latest setback for troops battling militants in Mindanao

Philippine troops accidentally killed 11 of their comrades as they battled Islamist militants, the latest in a series of incidents illustrating how the military is struggling to contain the threat of rebel groups.

Soldiers are fighting street by street in the southern city of Marawi with the Muslim-extremist Maute group, which raised the black Islamic State flag there more than a week ago after authorities attempted and failed to...

RELATED VIDEO

Philippines Fights Islamic Militants in Marawi

More than 100 people have been killed in the battle for Marawi city between Philippine government forces and the extremist Maute group, which has pledged allegiance to Islamic State. Photo: Getty Images